Mostly t.versicolor,apply canesten and do expose to sunlight for 10 minutes.
Without examination,confirmation of a diagnosis is tough but it can be pityriasis versicolor or pityriasis rosea.
Pityriasis rosea is a common human skin disease which presents as numerous patches of pink or red oval rash. The rash may be accompanied by low-grade headache, fever, nausea and fatigue and sometimes by itching.Pityriasis versicolor is a common skin infection caused by the yeast Malassezia furfur. This skin disease commonly affects adolescents and young adults, especially in warm and humid climates.
No treatment is usually required for P.rosea. In most patients, the condition lasts only a matter of weeks or months(upto six months).But for P.versicolor topical and oral antifungals may be needed.I would suggest a dermatologist’s consultation for the same.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional doubts.Kind regards.