Obviously some of us get them worse than others, and sometimes they come up in different colours depending on our genetics and skin tones, but they're very normal. ' [sic] My pregnancy stretch marks are white, but when I was younger I had angry red marks all over one boob when I had a lump. But moisturise... Maybe.
The red marks are actual blood.
( z0 blood :ARG1-of ( z1 actual ) :domain ( z2 mark :ARG1-of ( z3 red ) ) )
(z0 / blood
    :ARG1-of (z1 / actual-02)
    :domain (z2 / mark
                :ARG1-of (z3 / red-02)))
The red marks are actual blood .
z2 :ARG1-of z3
z0 :ARG1-of z1
z0 :domain z2