N’cifukwa ciani timacita imvi, ndipo n’cifukwa ciani anthu ena sacita imvi?

Mtundu wa tsitsi lanu umayendetsedwa ndi mitundu yosiyanasiyana ya melanin pigment, chimachitika ndi chiyani kwa melanin ndi zaka?

Imvi ndi zotsatira za kuchepa kwa melanin mu tsitsi, pigment yomwe imapezeka pafupifupi zamoyo zonse, osati mwa anthu okha. Ndilonso lomwe limalimbitsa khungu lanu poyankha kuwala kwa dzuwa.

Mwa mawonekedwe amodzi, kumabweretsa tsitsi lofiirira kapena lakuda, pomwe gulu lina limayang'anira tsitsi lofiira ndi mawanga.

Maselo amenewa amapangidwa m’maselo apadera otchedwa melanocytes omwe amapezeka mkati mwa zitsitsi zapakhungu.

Anthu akamakula, ma melanocyte sagwira ntchito kwambiri ndipo amatulutsa melanin pang'ono, mpaka pamapeto pake amafa osasinthidwa.

Kenako tsitsi limakula popanda mtundu uliwonse ndipo limawonekera. Kusiyana kwakukulu ndi majini, koma zinthu zina monga zakudya zopanda thanzi, kusuta fodya ndi matenda ena angayambitse imvi msanga.

Ngakhale zinthu zoopsa kwambiri nthawi zina zingachititse tsitsi kusanduka imvi msanga.