growth like seborrheic keratosis or due to HPV wart which is very contagious and can spread by touch from one part of body to another. You should consult a dermatologist to get it examined and preferably get a biopsy skin done to confirm the diagnosis. HPV warts are contagious, so till you have the active lesions any physical contact should be avoided.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.