Hello,
I cannot confirm anything without examination but it can be a mole,freckle,seborrheic keratosis(a non-cancerous benign skin growth that originate in keratinocytes and like liver spots, are seen more often as people age),solar lentigo(dark (hyperpigmented) lesion caused by natural or artificial ultraviolet (UV) light) or melanoma(chances are rare).
I feel that an examination by a dermatologist will be the best. Without examination,it is very difficult to say anything.
I hope that helps.Take care and pls do keep me posted on how you are doing or if you have ant additional doubts.Kind regards.