you need a diagnosis first. not something that i can provide for you blindly over the internet. unless the true nature of this "hard lump" is known and the reason for your night fevers (they do not have to be related) there is really no way for me or any medical professional for that matter to know if you need an antibiotic let alone a specific antibiotic without an examination. your first and most important step is to be properly examined and diagnosed. i would suggest that you not self-treat this lump with clindamycin since this may interfere with a culture if your doctor feels this is needed.
i have a hard lump on my butt cheek and been running a fever at night for the past two nights. would clindamycin help?