<s>[INST] I have a hard lump on the inside of my thigh, it looks like a insect bite, but it had a dark center. when i popped it only blood came out. it doesnt itch or hurt, though it is tender to the touch. should i be worried? or is it just an insect or arachnid bite? [/INST] hi.it is best if you consult with a doctor, preferably a general or an orthopedic surgeon, for clinical evaluation. there are a lot of possibilities including benign cysts, fibromas or lipomas. malignant tumor lesions should also be ruled-out. diagnostics such as x-ray, mri and a tissue biopsy may also be recommended. management (medical and/or surgical) will be directed accordingly.hope this helps.good day!!~dr.kaye </s>