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SKin on outer side of eye may become black due to a variety of reasons
-mostly dark circles
around eyes may occur because of chronic allergy
, allergy around eyes with rhinitis
may cause congestion around eyes which cause increased pigmentation which may cause skin darkening,
-second reason of darkening is smoking
marijuana and tobacco, this causes frequent rhinitis in individual and he frequently start rubbing eyes which may cause skin darkening.
- other reason is that due to chronic addiction individual becomes nutritionally depleted, deficiency of Vitamin B complex occurs which may cause skin darkening.
So to avoid this
- continue motivating him to quit marijuana and smoke.
- start Vitamin B supplements daily
- apply lemon juice on affected parts daily, which will increase vascularisation and will cause lighter color.
Hope I solved your query.