It could be many things. Anything from Infection, Allergic Reaction, or something more serious. The best way to find out is to have him visit the Doctor. It probably won't be anything sinister but if it is then an early diagnosis is always good. What is more likely to happen is that it will be something easily treatable and you can stop worrying!
dead man walking
A groin hernia is a protrusion of the intestine through the abdominal wall. It leaves a noticeable lump in the groin and can only be fixed by surgery.
A lump in the groin area could be due to various causes such as swollen lymph nodes, hernia, cysts, or infections. It is important to have it evaluated by a healthcare provider to determine the cause and proper treatment.
This sounds more like a strain. A hernia would show as 'lump' in the groin area. If you have any doubts or it lasts for more than a few days, see the doctor.
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Typically you don't see a breast cancer lump, but notice it when touching, washing, or scratching your breast.
This sounds like an infection. Get a doctor to examine it.
A small firm lump under your skin at the base of your penis could be a cyst, but this should be confirmed with a doctor.
A lump can be lots of things, maybe cancer or just a lump of flesh witch is absolutely harmless. You should go and get it checked out though because IF it is cancer it will be easier to treat the earlier you get it seen to.
Could be anything. Go to your doctor!
You may have torn a small amount of muscle and this could be the result.
A smelly lump on the back of the head may be an infected abscess. It could also be a sebaceous cyst.