Hi, It seems that you may be having tinea corporis and tenia cruris...a fungal infection caused by dermatophytes. Your close friends are having same disease, as it is infectious and spread by close contacts. Still, you consult dermatologist for firm diagnosis. After thorough examination and coming to the diagnosis of fungal infection, he may prescribe antifungal like ketoconazole or itraconazole orally for few weeks along with antifungal cream to apply like clotrimazole cream. To relieve itching, antihistaminics like levocetirizine may be taken. Avoid soap bath,as it might exacerbate the disease. Let your friend also be treated to prevent infection in other closed persons. I hope you got my answer. Thanks. Dr.Ilyas Pate MD