It presents as shiny, 3-5mm, slightly raised purple-red spots or a rash
with white streaks. It may also cause white ring
Usually it is diagnosed by physical examination but to confirm the diagnosis, a biopsy of the skin may be done by a dermatologist. This will confirm the diagnosis and also rule out other similar lesions like dermatitis skin, lichen simplex chronicus or eczema.
Hope that this information helps and hope that you get better soon.
Wishing you good health.