Cutis. 2006 Jan;77(1):39-41.
Cupric keratosis: green seborrheic keratoses secondary to external copper exposure.
Peterson J1, Shook BA, Wells MJ, Rodriguez M.
These look like seborrheic keratosis(not serious). The green pigment may be from outside relating to applications, or copper from water, as in swimming pools.Do consult your doc