[gladhandsgrow]

Looks like thrips, aphid, or some kind of leaf miner damage for sure. Look under the leaves and you might see some little white /translucent bugs there. Marrone Bio-innovations products Venerate and/or Grandevo would help. Since you’re in week 4 of flower you don’t want to be spraying anything. However, there are some products that say you can spray until harvest. Dr. Zymes and lost coast plant therapy, I believe make that claim.