Hi dear user...
welcome to HCM..,
and blackheads are commonly seen in Ur age ...,
because it is due to androgenic hormones hyperactivity and by adding bacterial action( propionibacterium acnes
) will produce this condition....,
2)Darkening of Ur face andskin is due to sun tanning
..( UV light affect)
3) Tretment side ....
go for a) frequent soap and water washes ( use Triclosan
b) Topical Erythromycin
gel on face morning times..., Adaplene in n night times
c) Oral antibiotics
like Doxycycline capsules 100 mg daily
d) Sunscreen lotions like UVA guard or Suncare morning times 15
mts before going out side ...o.k.goodluck