The wingspan of Prochoreutis myllerana can reach 10–14 mm.  Forewings are variegated brown, with a dark brown median fascia showing white dusting. These moths are characterized by 2 + 2 white dots on the upper part of the wings, near the edge.
Prochoreutis myllerana is very similar to Prochoreutis sehestediana,  but in the latter the white dusting extends more than half way towards the costa of the forewings and the mentioned 2 + 2 white dots are missing.  The apex of P. sehestediana is more pointed.  Moreover in P. mullerana head of larvae is uniformly pale brown, contrary to Prochoreutis sehedestediana. 
Adults are on wing from May to early September. There are probably three generations per year.  The monophagous larvae feed on Scutellaria galericulata and Scutellaria minor.  The young larvae mine the lower leaves of their host plant. Older larvae live free among spun leaves. There are also records on Lamium album and Lamium purpureum,  but these need confirmation.  Full grown larvae can be found in June and July – August. Probably these moths hibernate as adults.