| Tinea Versicolor |
- Caused by Malassezia furfur (normal skin flora overgrowth)
- Hypopigmented (or hyperpigmented) patches that DON'T TAN in summer
- Fine scale; commonly on chest, back, upper arms in adolescents/young adults
- Risk: sweating, humid environment, immunosuppression, oily skin
- KOH prep: 'spaghetti and meatballs' (hyphae + spores)
- Treatment: topical ketoconazole or selenium sulfide shampoo (NOT corticosteroids)
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| Vitiligo |
- Complete depigmentation (NOT just hypopigmentation); no scale
- Autoimmune destruction of melanocytes; well-demarcated chalk-white patches
- Associated with other autoimmune diseases (thyroid, DM1, Addison's)
- Treatment: topical steroids, calcineurin inhibitors, NB-UVB phototherapy
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| Pityriasis Alba |
- Ill-defined, hypopigmented, dry patches on face in children with atopic dermatitis
- Post-inflammatory; no significant scale; fades spontaneously
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| Pityriasis Rosea |
- 'Herald patch' (single large oval lesion) followed by 'Christmas tree' distribution on trunk
- Collarette of scale along the inside of oval lesions; associated with HHV-6/7
- Resolves spontaneously in 6–8 weeks; treatment: symptomatic only
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