Forming of white patches on skin back and armpit

Professional Assessment: The presentation of white patches on the back and armpit in a 22-year-old male most strongly suggests vitiligo as the primary differential diagnosis, followed by pityriasis versicolor, pityriasis alba, or postinflammatory hypopigmentation. The pathophysiological mechanism likely involves either autoimmune destruction of melanocytes (in vitiligo) or superficial fungal infection affecting melanin production (in pityriasis versicolor), with the young adult age being a typical presentation window for both conditions. Given the patient's age and location of lesions, additional risk factors may include recent stress, autoimmune conditions, family history of vitiligo, or excessive sweating in the affected areas. Further diagnostic workup should include Wood's lamp examination, KOH preparation if fungal infection is suspected, and potential autoimmune screening tests, along with a detailed personal and family history to guide appropriate management strategies.

For treating white patches on the back and armpit, apply an antifungal cream containing miconazole or clotrimazole twice daily for 2-3 weeks, as this is likely tinea versicolor (a common fungal infection in young adults). Additionally, use an anti-fungal medicated body wash containing selenium sulfide or ketoconazole during showers, leaving it on the affected areas for 5-10 minutes before rinsing. To prevent recurrence, maintain good hygiene, wear loose-fitting breathable clothing, and keep the skin dry, especially after sweating. For additional treatment recommendations, ask in the chat.