Rough, bumpy skin on arms and legs
Rough, bumpy texture on the backs of the arms, the thighs and the shoulders is extremely common. It is a look and a feel rather than a problem you have done something to cause.
Naming it honestly
Strawberry legs and chicken skin are everyday names, not diagnoses. If something is painful, spreading or changing, that is a conversation with a doctor and not with a serum.
What tends to help the look of it
Keeping the area properly hydrated changes how rough it feels under your hand and how it catches the light. Scrubbing tends to make it feel worse rather than better, because taking the top off leaves the surface drier.
Using a roller below the neck
The same routine works on arms, legs and shoulders. The areas are larger, so a set goes faster than it does on a face alone.