There is this weird patch on my chick's back

[Sheybae]

I got this a Buff orpington at one of the pet's feed today, and i noticed that there was this molted area on the back of the chicken. The chick looks to be around 2 to 3 weeks old and its making me a bit worried. (I'm scared it might be a rash or an infection).

And i wanted to know what exactly it is and if i'm able to put it back with the other chicks.

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[21hens-incharge]

How man other chicks were in with it? Could there have been some plucking going on with them?
Have you checked it for mites or lice? (thinking mites are unlikely due to the location of the missing feathers)

It does not look infected just plucked. Chicks and adults that are lacking in the feed department will do this. Boredom is another cause of missing feathers on chickens.