Como eu digo "pele flácida" em inglês

Português: pele flácida.
Inglês: saggy/sagging/flaccid/flabby skin.

Exemplo 1: Why does sagging skin occur? Ref. eucerin.co

Exemplo 2: Student nurse in plea over saggy skin and vanished breasts after 7 stone weight loss. Ref. getsurrey.co

Exemplo 3: The condition, characterized by flaccid skin, is thought to result from impaired elastin turnover. Ref. academic.oup

Exemplo 4: Body Lift procedures can restore the tone of the skin and tighten flabby skin. Ref. cadoganclinic

Cf. Como dizer "Barriga flácida" em inglês

OBS.: A palavra "flabby" pode ser utilizada em sentido figurado: fraco, frouxo

Exemplo 5: They have a banal conversation in the car about how the world has changed in recent years, but don't be put off: this is the only flabby moment in Billy Ray's otherwise taut screenplay. Ref. theguardian