Neither one is 'correct' they are both used in common parlance.
There is no difference between a bump and a lump.
A bump is a lump like, for example, a bump on your skin or a bump in a road.
LUMP
Bump Chump Pump Lump
The English translation of "bukol" is lump, swelling, or bump.
Like a hairy lump
Depends on the nature of the lump/bump. Might be acne (yes, it does happen there), or it could be something much, much, worse, and destined to cause you a whole lot of suffering.
It is Knock
A person with a bump could be described as having a swelling or lump on their body. It would be best to refer to them based on the specific location or cause of the bump if known.
it may be a serois medical conditiion, ask a vet. is the rat old? is the bump big? is the lump swollen? is the bump on a patch of thin skin? where has your rat been? is the bump smooth or scaly or something else?
swelling, bump, lump, protuberance, prominence, tumescence.
Bump, clump, (a) hump, slump, grump, lump,