Subcutaneous injection deposits IGF-1 LR3 into the fatty layer just under the skin (commonly the abdomen, around 2-3 inches from the navel, or the upper thigh)
Rubbing pushes medication toward the skin surface, can increase bruising by spreading blood from nicked capillaries, and may cause the injection to create a visible welt
Ignore single-day spikes
Trends in FDA FY2023 Inspection-Based Warning Letters, February 13, 2024
A., Dvorkin, E., Homel, P., Malamud, S., Culliney, B., Lapin, J., & Esteban-Cruciani, N
& Monaco, M