Injection site reaction - how long?

For those who experienced injection site reactions, how long did it last for before your body got used to it? I started 26 days ago and I am still at 1.2. I started to get red inflammed spots a day after the injection. It started around 15 days in. They barely itch, and they go away after a week or so. I tried injecting in different places, tried icing before injecting, tried Reactin and benadryl cream but it doesn't make any difference. I read from other users that you have to wait for your body to get used to the medication. I know that injection site reactions are part of the side effects but how long did it last for you? First pic is yesterday's injection and second pic is the day before yesterday. They get bigger before they go away.