Hello and welcome to healthcaremagic I have gone through your query and I have understood it I would keep a possibility of pityrosporum folliculitis (caused by proliferation of yeast, Malasezzia furfur). Pityrosporum folliculitis is commonly seen in hot, humid weather conditions. Clinically it can be confused with acne except that Pityrosporum folliculitis ITCHES a lot unlike acne. Pityrosporum folliculitis commonly involves trunk, chest and shoulders (all these areas are rich in sebaceous glands therefore providing an ideal environment for the yeast to feed upon). All these areas may or may not be involved simultaneously. Oral Treatment: I would suggest an oral antifungal e.g itraconazole 200mg once daily for a week OR oral fluconazole 150mg once every week for 4-6 weeks. Oral antifungals kill the yeast rapidly and bring about rapid relief. Topical treatment: You could also use a topical antifungal e.g ketoconazole cream, once daily OR Apply a 2% Ketoconazole shampoo over the affected area during bath, lather it well, leave on for 5 minutes, once daily Hope this helps Regards