If you find discarded cuticles lying around on your plant's leaves (this is a geranium leaf), it's a sure sign of pest trouble. These look like aphid cuticles, and aphids reproduce very quickly. So check the plant immediately and take appropriate action.
I use thiacloprid spray (eg 'Provado Ultimate Bug Killer', which is a long-lasting systemic (enters plant and moves to where needed) pesticide. But you can use an organic spray, or even soapy water (some growers even wash them off with plain water). The only downside with contact pesticide sprays is that, because they work by contact, you must apply to the whole plant.
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