Hi Mafiadon***** thanks for your question well you are having a rash on the tip of penis and which is spreading and there is no other symptom. Also you are not sexually active. Dear friend first of all you need not to worry. Its a simple fungal infection most probably Candida or in simple terms yeast infection. These infection may develop in an individual under various situations as- immunocompromised states after prolonged stress, fever antibiotic therapy diabetes mellitus due to excessive sweating in early or late winter months tight undergarments etc. Usually itching, slight soreness, burning, redness or rash develop at site. you can apply clortrimazole cream on the site or tab. fluconazole single dose will work. be assured that its not a serious infection and don t worry hope i solved your query thanks and kindly rate :)