| Keratosis Pilaris |
- Rough, skin-colored follicular papules on upper arms, thighs, cheeks
- Mild pruritus in winter; worsens with low humidity; no pustules
- Plugging of hair follicles by keratin; associated with atopic dermatitis, ichthyosis
- Treatment: moisturizers, alpha-hydroxy acids (lactic acid), urea; cosmetic concern only
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| Folliculitis |
- Pruritic or tender erythematous papules/pustules around hair follicles
- Caused by S. aureus (most common) or Pseudomonas ('hot tub folliculitis')
- Treatment: topical mupirocin (localized) or systemic antibiotics (extensive)
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| Pseudofolliculitis Barbae |
- Erythematous papules/pustules on beard area from ingrown hairs
- Occurs in Black men with tightly curled hair; curly hair re-enters skin
- Treatment: stop shaving, warm compresses, topical retinoids
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| Miliaria (Heat Rash) |
- Small vesicles/papules from blocked eccrine sweat glands; hot/humid environments
- Miliaria crystallina (clear vesicles, superficial) vs miliaria rubra (red papules, deeper)
- Resolves when patient cools down; treat with cool environment
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