I-Blue nevus yakheka lapho amaseli akhiqiza umbala ehlala ejulile esikhunjeni kunokujwayelekile futhi ahlangane lapho. Izakhi zofuzo, ukuvezwa kwe-UV, nokushintsha kwehomoni konke kungaba nomthelela, kodwa ayikho imbangela eyodwa eqinisekisiwe.
Iningi lama-blue nevi awanabungozi nhlobo futhi ahlala ezinzile impilo yonke. Ingozi yokuthi i-melanoma ithuthuke ku-blue nevus iphansi kodwa iphakeme kancane kunemole ensundu evamile, ngakho noma yikuphi ukuguquka okubonakalayo noma izimpawu ezintsha kufanele kuhlolwe.
Uma i-blue nevus ibukeka ijwayelekile futhi ayiguquki, ayikho imithi edingekayo ngaphandle kokuhlolwa njalo. Lapho kudingeka ukususa—isibonelo, uma iguquka, ilimala kaningi, noma ibukeka ingajwayelekile—ivamise ukusikwa ngokuhlinzwa bese ithunyelwa ku-histology; izindlela zelaser noma zokubanda azinconywa.