This kind of bump can be a swollen lymph node,a sebaceous cyst or a lipoma. Lymphadenopathy (swollen lymph nodes) is usually caused by a viral or bacterial infection along with other numerous causes. Sebaceous cyst is a closed sac and fills with a fatty white, semi-solid material called sebum produced by sebaceous glands of the epidermis.Lipoma is a benign fatty tumor.What exactly it is can be confirmed only after examination.I would suggest you to get a dermatologist’s evaluation done.
I sincerely hope that helps. Take care and pls do keep me posted on how you are doing or if you have any additional doubts. Warm regards.
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