My 24 year old son has developed a lump near his collarbone at the base of his neck on the right side. The lump is not painful, about the size of an olive and moves when pushed. The skin looks bruised over it but my son says he doesn t remember bumping that spot or anything. What could it be?
Welcome to ChatDoctorHe must be having enlarged lymph node which is infected also. Infection can give rise to such lung with redness. You should show it to surgeon for confirmation of diagnosis. If it is soft that may indicate abscess formation that may require Chat Doctor.  If abscess is not formed yet tablet amoxicillin with Slavonic acid 625 mg three times a day for5 days will improve it and lump may regress in size. If not then fine needle aspiration cytology/FNAC of lump may be required to find out the cause of lump. Regards.