@Just01 I know you are slim and I know it is hard to lose an addiction to sugar, but sugar breaks down the collagen fibre which will create the pockets between skin and muscle and that's cellulite.
We all have fat, but it is located under a thick and tight barrier, if there are breaks in that barrier, the fat will show.
You can work on cellulite with massage but to fix the collagen you need to change the diet.
If you have a genetic predisposition, you need to be more determined.
I know it is hard with covid, but water, swimming, walking in water, alternating cold and hot water helps a bit.
Your cellulite didn't become so bad overnight, it will take time and effort to reduce it. Auto massage and dry brushing really help,.
How bad do you like that cookie or ice-cream. More than the idea of wearing a bikini. It is easier to cut ALL sugar, instead of reducing, as it will leave craving.
You should tackle your cellulite not only for aesthetic reasons, but because it could become painful in the future.
IF you usually snack on sweet stuff in from t of telly, switch the bowl for a dry brush and while you watch, brush your legs, 15 mins each and then with an oil, massage them, pinching and rolling the legs. There are videos online.
You care enough you posted on MN, now take the second step and clean your cupboards. 