Darkening
of the
fingernails
or toenails
O
S
M
C
C
M
M
O
O
O
S
O
M
O
M
O
C
O
S
S
C
O
C
O
Size:
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Start
O
History
Start
O
S
M
C
C
M
M
O
O
O
S
O
M
O
M
O
C
O
S
S
C
O
C
O
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