I've three keloids on my ears due to piercing. should i go for steroid injections? are they safe ?

Yes (low risk): There are risks to nearly any intervention and this includes over correction with atrophy, telangiectasias ( spider veins) and/or ulceration. This may take more than one session.

Safe=yes,effective=?: Steroid injections are typically safe when performed properly to reduce problematic scarring. However, true keloids of the ear after piercing, in my experience, usually require complete excision.

Yes low dose steroid: Small keloids can be treated safely with low dose steroid injections and your doctor may also utilize this option if the keloids are too close to each other and surgical excision & reconstruction of all of them in one sitting may not be possible. Other treatment options include pressure, silicone gel sheet, scar care creams and for the recurrent lesions radiation treatment.