The phrase "painful lump" refers to a small, swollen area on the body that causes discomfort or hurts when touched. It can indicate an underlying issue or health concern. Full definition
After a year of this I noticed a big painful lump in my perianal area.... (ashotofadrenaline.net)
Chrysis died a while back after the breasts «were injected with wax that hardened into painful lumps and eventually seeped into her bloodstream.» (firstthings.com)
There are varying degrees of «plugged» ranging from a small lump that ends up causing milk blister (this is what I had, repeatedly), to a larger, more painful lump that can turn into mastitis, if you're not careful. (romper.com)