He developed a painful furuncle on his back.

She had multiple furuncles on her back.

She developed a furuncular infection on her back.

She was diagnosed with furunculoses after developing multiple boils on her skin.

He was diagnosed with furunculosis and was prescribed antibiotics.

I bought a new furutobeite for my living room.

He developed a furunculous infection on his back.

The Furukawas are a close-knit family.

My friend's last name is Furukawa.

My friend's last name is Furuichi.