Cyst or lipoma: Cysts & lipomas are often soft & painless. However, the former can become painful & even harden if distended & filled, much less infected. Lipomas, or fatty tissue, typically remain soft & painfree. Abscesses are collections of pus that are usually painful & need to be lanced/drained. Have him go see his family doc for evaluation & your reassurance.
Answered 4/28/2019
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