Lumps or hard growths on the body are common and usually are benign (noncancerous) in nature. Lipoma, enlarged lymph nodes, fibroma, skin abscess, hernia, and ganglion cysts are the most common causes of a lump under the skin. Consult a doctor immediately if the lump is painful, red, leaking pus, fever, and if it is bigger than 10 cm in diameter.
Lump on Testicle: Causes, Symptoms & Treatment Options
If you notice any lumps or swelling in your testicles, do not panic, but you should definitely see your doctor to get them checked out, just to be safe.

Cancer Lump on Back of Head - Causes, Symptoms, Diagnosis, and Treatment
A cancer lump on the back of the head is a suggestive sign of head and neck cancer. Read this article to know more about it.
Lumps in the Scrotum: Symptom, Diagnosis, and Treatment
Lumps in the scrotum or scrotal masses are usually non-cancerous and occur in the skin covering the testicles or scrotum. Read below to know more about it.