**While messing around, I came up with this one. Enjoy. (The texture coordinates on my copy of James are somehow swapped! The left and right side have switched. Oh well)**

 

clr = ImageMap(":Runtime:Textures:Poser 6 Textures:James_Face_Color.jpg")
bump = ImageMap(":Runtime:Textures:Poser 6 Textures:James_Face_Bump.jpg")

poison ivy function - don't ask me how I come up with these crazy things

effect = Bias(Scale(inv(Abs(2.5 * FBM(1, 4, 3, 3, .2, .2, .2, 0, .5, .3) - .5)), .2, 1), .8)
effectclr = RED * clr
effectdisp = effect

s = Surface(clr, 1, 1, .1, .5)
s.Bump = .03 * bump

generalized effect control here - center, x and y scale, radius, strength, and displacement

cx = Add(.4).labelled("PM:Effect CX")
cy = Add(.525).labelled("PM:Effect CY")

x = (U - cx) / Add(1).labelled("PM:Effect X Scale")
y = (V - cy) / Add(1).labelled("PM:Effect Y Scale")

er = Add(.07).labelled("PM:Effect Radius")
es = Add(.25).labelled("PM:Effect Strength")
ed = Add(.03).labelled("PM:Effect Displacement")

r = sqrt(x * x + y * y)

here I limit the effect using r from above

effectInR = Clamp(Scale(r, er, er/4)) * effect

change the color

s.Diffuse_Color = Blend(clr, effectclr, es * effectInR)

and make the welts/hives/whatever their called

s.Displacement = ed * effectdisp * effectInR

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)