Progesterone in oil injections

Steph
Is anyone else doing progesterone oil injections to the booty? We have to do them for 8 weeks (currently at 6 weeks) and my poor wife's butt is covered in bruises and really big knots. So bad that it hurts her to sit down and get up from bed/chairs. I'm doing the shots exactly how our fertility clinic instructed me to. We also warm up the oil before using it (hold it against our skin for a while). 
Anyone going through this? Is the pain/bruising/swelling happening to you too? Any tips or tricks you and/or your partner have been using? Thank you!