Hi, thanks for sharing your health concerns with HCM! Well, a lipoma is just collection/excessive accumulation of normal fat cells within a fibrous cap and sometimes might cause cosmetic problem or pain but not to worry as only rarely this could be malignant! it could be infected due to excessive manipulation/rubbing etc... Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing your son good health.