Hi, thanks for writing to HCM.
Based on the description of symptoms, it could possibly be a Lipoma
which is nothing but fatty mass. This is generally harmless and will not produce any symptoms.
If the lump is considerably large, it requires surgical excision. Smaller lesions may be injected with steroid
injections which may reduce the size but will not completely eradicate it .Consult a General surgeon
for further management.
Hope this information is helpful. Good day