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You are probably feeling the insertion of deltoid mucle into humerus bone.
Please see the image corresponding to deltoid tuberosity in the link below and tell me if it is the same location.
This is not deltoid tuberosity.
These are likely to be benign soft tissue growths arising from skin or subcutaneous tissue.Some of the common ones are epidermoid cysts, lipomas and neurofibromas.
You may need FNAC that is fine needle aspiration cytology to determine the nature of these soft tissue lumps.In this test a fine needle is used to aspirate fluid from the lump which is examined under a microscope to look at the cells aspirated in the fluid.These cells give an idea about the nature of the lump.