I have solved the diagnosis, it's what you said"lichen nitidus"
Hello,
One possibility for your symptoms that should be ruled out is of lichen nitidus. Lichen nitidus is characterized by 1-2 mm, discrete and uniform, shiny, flat-topped, pale flesh-colored or reddish-brown papules. Generally it is self limiting but severe cases may need glucocorticoids.
I suggest you to get it evaluated from a dermatologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.