Hello Kanchan,
I agree with Violablue - this sounds more like a problem for a doctor or dermatologist rather than a physiotherapist. As the nodules are not red or painful it does not sound like a dermatitis or engorged pimple.
It would be wise to have the area checked by a professional as some skin conditions can be associated with facial scarring. If you are exposed to the sun frequently the area can also be susceptible to various types of skin cancer, also a good reason to get checked. Some areas of the world also have problems with organisms that can grow under the skin, causing lumps. It may only be blocked sebaceous glands, bt please seek advice from someone that can actually look at the problem.
Cheers,
MrPhysio+