Hello there. I can understand your concern. For to give you a opinion on this question, we need to see the lesion. There are many things that can occur as a red spot anywhere on the body. How can we know what you have without us seeing. Seborrheic dermatitis is your diagnosis but you aren't a medical practitioner are you? So I can't take that as a diagnosis though you may be right. Consult a dermatologist for further evaluation. Best regards. Dr. Anil Kumar Jain