<s>[INST] y girlfriend has a bump on her lower back that is barely visible but it s right above her waist line? And some days it doesn t bother her at all but days like today, she couldn t hardly walk cause it hurt so bad and then she went in the shower for awhile and then she got out and it still hurt and she couldn t sit without it hurting, any ideas? Also she has a lump in her armpit too/ [/INST] Hi,Dear,Welcome with your query to HCM.Studied your query in full depth of its details.Reviewed it in context of your health concerns.Based On the facts, You mostly seem to suffer from-2 seperate entities-The lump?Lipoma / Sebaceous Cyst- in the lower back seems to be with ?either Muscle Catch from sprain in the lower back, or from neural compression of acute nature with change in spine positions and maneuvering required in day to day movements and work.or it could also be due to the Neurolipoma which gets triggered with some movements or trauma to the lumpThe other lump in the armpit - is mostly from Furunculitis.Other causes  like related to nodes/ or the breast,need to be ruled out by Second Opinion from Surgeon .X-ray spine and FNAC Biopsy would resolve this issue of lower back lump.Hope that ,This reply would help you to plan further treatment soon with your treating doctors.Best of Luck and early recovery.Welcome any further query in this regard,which would be replied in next session.Good Day!!Dr.Savaskar M.N.Senior Surgical Specialist </s>