Hi
It would be difficult to assess without having a look at the
lesions as they may be due to several causes like stress, reaction to some medication, milia, perioral dermatitis, contact dermatitis, allergy, rosacea, melasma, psoriasis, irritants etc. However, it seems from your description that the lesions might be a skin condition called milia.
Milia, also known as milk spots are pearl-like whiteheads (may look like small grains of sand).