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
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.