Lack of circulation causes your hands to turn purple. Often times, cigarette smokers' hands turn purple in the cold. I know this, because I am a cigarette smoker and my circulation is horrible due to the nerve endings being damaged from the chemicals in the cigarettes. Also, I take adderal in quite the abundance (approximately 400 mg in a day) and I always notice the day after that both of my arms will turn purple and my hands will also be purple and clammy. That's because the amphetamines pinch off your nerve endings reducing the circulation. There are many factors that can account for purple body parts, you just need to keep an eye on what you are putting into your body and make sure you're taking the amounts you're supposed to. Because, let's be completely honest, purple hands are beyond unattractive.
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i think they might just be crusty or if you have Asthma that might be another reason, also happens in the cold ho purple are they? it depends i had crusty hands and i started getting little cracks which felt like a cut and it hurt alot i just got my soft hands back, people used to make comments about my hands and having them crusty was embarrassing people liked my hands because they thought they were very soft. if their crusty wash your hands and have some aloe vera lotion on your hands (other lotions might work as well) if it's asthma then i don't know cause i don't have asthma. I've heard that they might get purple because you need more air/oxygen.
You've not provided enough information to answer the question.
Under what circumstances are your finger tips turning purple? Is it a periodic occurrence, or are they always purple? Is there any other sensation along with them changing colour (such as numbness, tingling, pain)?
Normally because of the heat, or the blood rushes to your hands, if that's the case then what you need to do is hold your hands up to let the blood flow normally
Poor circulation and blood flow can cause your hands to turn a purple color. There may not be enough blood getting to your hands, but it's nothing to worry about. It will go away soon.
if could mean a lot of things but if its also cold it could be poor circulation. especiallly if you have thinner skin