By Elvin Chizenga, PhD
Editor’s note: This expert article is part of an ongoing exploration of trust, sensitivity, and more thoughtful care in men’s intimate health. For founder context, read the Journal.
Friction: The Most Constant Physical Stress on This Skin
In every physically active adult, movement, simply as walking or running, causes some level of friction in the genital and perianal regions that generates mechanical stress. Skin in this region is thinner, more hydrated, and less protected by the outer keratin layer than skin elsewhere on the body.
In addition, skin folds create areas within the skin where two surfaces contact each other continuously, making even low-level friction from walking, sitting, or exercise significant mechanical stress that can irritate the skin.
What amplifies friction damage
The reason why not all friction causes direct damage is that there are other things that amplify it. Regulated heat and sweat increase the skin’s endurance to friction, to begin with, but extended periods of moisture soften and weaken the barrier, making it more vulnerable to tearing. Increased physical activity, particularly running, cycling, or prolonged walking in warm conditions, is a common acute trigger.
Moisture, heat, and occlusion create an environment that exacerbates skin issues.
Although regulated heat and moisture are beneficial for the skin, in the groin and perineal folds, excessive moisture raises local skin temperature and pH. Prolonged moisture softens the stratum corneum (a process known as maceration), which makes the skin structurally weaker and more susceptible to damage1. Tight clothing exacerbates this condition.
Tight non-breathable synthetic fabrics often trap heat and moisture against the skin, creating a warm, damp microenvironment that accelerates barrier breakdown. Similarly, hot, humid climates, intensive exercise, and prolonged sitting in non-breathable garments all concentrate this effect.
Some underlying diseases, such as obesity, diabetes, and hyperhidrosis (excessive sweating), amplify warmth and dampness while also making the skin more susceptible to friction damage by affecting skin tone, texture, pH balance, and moisture content.
Harsh Cleansers and Over-Cleansing: When Good Intentions Cause Damage
Ironically, some grooming practices intended to prevent skin damage are actually among the primary culprits of irritation.
Because this damage is cumulative, with each wash adding up to prior disruption rather than resetting the skin, overcleaning or the use of harsh cleansers is leading to non-intentional causes of irritation.
What to Consider before Choosing a Skin Care Product
Products marketed for cleanliness or odor control often contain surfactants, alcohols, and antimicrobial agents that are appropriate for more robust skin areas but are too aggressive for thin, sensitive anogenital skin.
Most bar soaps and general body washes are alkaline (pH 9–10) by formulation, and genital skin has a naturally acidic surface for maintenance of function. In turn, these alkaline products disrupt the acid mantle, interrupt skin enzymes that maintain the barrier, and increase transepidermal water loss2. Similarly, antibacterial agents designed to remove unwanted bacteria do not distinguish between unwanted microorganisms and the skin barrier itself, causing more damage than intended.
Shaving and Grooming: Mechanical Damage to Skin That Is Already Vulnerable
Shaving is counterintuitive because it removes a thin layer of the stratum corneum (the protective layer) with each stroke. In the end, with each shave, the skin is left temporarily more permeable, more reactive to friction, and more vulnerable to both irritants and allergens in any product applied afterward.
The skin layer typically replenishes itself within a few days after shaving, but this recovery is prolonged with frequent shaving. A common condition called Razor burn occurs when the skin responds to mechanical trauma with inflammation.
Shaving-related traumas go beyond the stratum corneum to itchiness, pain, and discomfort from ingrown hairs (pseudofolliculitis), which occurs when cut hairs re-enter the skin or fail to exit the follicle, causing a localized foreign body reaction. Ingrown hairs are more common in the genital and perianal areas than elsewhere due to coarser, curlier hair and moisture3.
Individuals with naturally coarser or curlier hair textures are at significantly elevated risk of ingrown hairs, regardless of technique. For these individuals, shaving frequency and blade choice have outsized consequences. Notably, existing eczema or psoriasis involving genital and perianal skin should be considered an absolute contraindication to shaving as a routine practice.
Some Simple, Practical Care Principles
Overall, excellent grooming practices extend beyond cleaning and using pleasant products; the following routines will keep you out of the doctor's office while also providing additional health benefits:
· Wearing loose, breathable underwear and avoiding tight clothing.
· Hydrating and eating correctly, including meals that balance your pH and provide your body with the necessary vitamins and amino acids for healthy skin. Eating well and being physically active can naturally prevent bad body odors.
· Cleansing: Use lukewarm water at most once daily, and if a product is used, choose a fragrance-free, low-irritant cleanser with a near-neutral pH; avoid using antibacterial or deodorant products in this area.
· Grooming: Less frequent shaving reduces cumulative mechanical damage; use sharp single-use blades; do not apply fragranced products immediately post-shave.
· Learning about allergens and irritants in everyday products and making informed choices about what to use. Switch to fragrance-free, preservative-minimal alternatives if irritation is present.
When should I see a doctor?
Doctor appointments are not necessary for irritations induced by a visible stimulus. If you notice irritations after using a new grooming product or engaging in a new activity, it is best to discontinue use and, whenever possible, avoid any friction, such as skin rubbing and tight clothing.
However, if irritations do not improve after a few weeks of removing likely causes, and if you experience painful lesions, inflammatory nodules, unbearable symptoms, a spreading rash, blistering, breakdown of the skin surface, recurrent symptoms in the same location, or uncertainty about whether the issue is irritation or something else, it is best to visit a doctor.
Always note that when chronic conditions linked with dermatitis coexist with moisture or friction from walking, exercise, or tight clothing, the problem may become more severe and necessitate medical treatment. Likewise, acute hypersensitivity reactions to new chemicals in grooming products or clothing may demand immediate medical attention, and if acute debilitating symptoms occur, always contact your doctor.
Summary
Most common genital and perianal irritation occurs from a self-reinforcing cycle where friction breaks down the barrier, moisture reinforces the damage, allergens reach sensitizing concentrations, and the inflamed skin becomes even more vulnerable to friction. Daily grooming and over-cleansing injure and remove a superficial protective layer, but we can identify the primary causes early by only being self-aware, and this is the basis for effective management.
References
1. Nakazawa H, Imai T, Suzuki M, Akakabe N, Hatta I, Kato S. Simultaneous Measurements of Structure and Water Permeability in an Isolated Human Skin Stratum Corneum Sheet. Polymers (Basel). 2019 May 8;11(5):829. doi: 10.3390/polym11050829
2. JAAD. Impact of cleanser pH on maintaining a healthy skin barrier. 2017. DOI: 10.1016/S0190-9622(17)31962-X
3. Ogunbiyi A. Pseudofolliculitis barbae; current treatment options. Clin Cosmet Investig Dermatol. 2019 Apr 16;12:241-247. doi: 10.2147/CCID.S149250.
Related reading: Read What Makes a Cleanser to Harsh for Intimate Skin