Mites/aphids or grower error.
Looks like you are in flower. If it is mites, NOW would be the time to figure it out before it gets out of hand. Look for white/black tiny dots could be adult/young mites or mite shit on the bottom AND TOPS. Look for tan/white/yellow/orange eggs under (sometimes on top) the fan leaves. Spray the entire top foliage including the buds with 1 part h202 to 5 parts water, and look around good for webbing under any leaves or around any bud sites, you must look good as those bastards will usually only web up only 1-2 cola's for protection/waste ect. The spray will help 100x with finding webs alpng with killing off any adults by contact and preventing mold on the flowers, the water will collect on the web and make them shiny and easy to see, if you do not use the h202 then be sure you have low humidity so you dont accidently rot your buds. I advise you to check now because its actually hard to tell if you have mites untill its too late. Its quite easy to prevent with high humidity and low temps, but once you get them you will need a combination of things to beat those bastards you cant just crank up himidity and lower the temps and expect them to be gone, been there done that, do not waste your time. Any webbing or scorching/bleaching/yellowing of fan/sugar leaves and you probably have them. If the fan leaves yellow with green veins but dont want to drop like nitrogen deficiency then you probably have them. If you do,get rid of them asap. Clean the room ect. The only way to get rid of mites for me was to insecticide the entire outside and garden of my house, along with inside my house. they do not take over my healthy plants, but thats not the point. Those tiny fuckers are just nasty. I would rather smoke a bud dipped in dog shit (sarcasm)