Hello,
From the symptoms it can be dermatitis skin, seborrheic dermatitis or fibrous papule of the nose.
Seborrheic dermatitis is a common skin condition that causes flaky,dry, white to yellowish
scales to form on oily areas esp. under the nose or anywhere on face. People with seborrheic dermatitis produce too much sebum (the natural skin oil). Later, pityrosporum yeast grows excessively in the sebum, sometime along with bacteria, making the dermatitis more persistent.